• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>IEEE Aerospace Conference >The terrestrial planet finder
【24h】

The terrestrial planet finder

机译：陆地行星发现者

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Terrestrial Planet Finder (TPF) is a spacebased astronomical telescope that will combine high sensitivity and spatial resolution to detect and characterize ～150 planetary systems within 15 pc of our Sun. In a five year mission, currently expected to commence in 2012, TPF will look for the atmospheric signatures of life using the methods of planetary spectroscopy. This is only possible if implemented within a telescope or interferometer whose spatial resolution is capable of resolving the planet as distinct from its parent star, and yet being able to suppress the starlight to a level of 10{sup}-6 or better. The design of TPF that had been used to illustrate the feasibility of the mission was an interferometer composed of a four-element linear array of 3.5-m diameter telescopes situated in an orbit at L2 and observing over the spectral band of 3-30 microns. At these wavelengths an earth-like planet would be more easily detectable in the glare of the parent star, but the angular resolution required for planet detection implies telescope separations of between 75 and 200 m, and separations of up to 1000 m would be needed for general astrophysics. The interferometer had therefore been envisaged as an array of free-flying telescopes. More recent design studies for TPF have also considered the possibility of having it built as a single-aperture optical telescope. The required angular resolution for planet detection could then be achieved with a mirror spanning 8 or 10 m in diameter. Possible designs include coronagraphs with circular, square, rectangular, or other shaped entry pupils, with tapered transmission across the pupil to suppress unwanted sidelobes in the diffraction pattern. Coronagraphs with phase masks have also been proposed to more efficiently suppress starlight. For these coronagraphs the principal challenges include not only the suppression of scattered light but the design of adaptive optics systems with sub-nm control. The design requirements and the current status of research will be reviewed. TPF is a key element in NASA's Origins Program and is currently under study in its Pre-Project Phase.
机译：地面行星发现者（TPF）是一个超基于天文望远镜，将高灵敏度和空间分辨率结合起来，以检测和表征〜150个行星系统在我们太阳的15个PC之内。目前预计2012年的五年任务，TPF将使用行星光谱法寻找寿命的大气签名。只有在望远镜或干涉仪内实现，这是可能的，其空间分辨率能够将行星分解为与其父颗星不同，但却能够抑制星光至10 {sup} -6或更好的水平。已经用于说明任务的可行性的TPF的设计是由位于L2的轨道中的四元件线性阵列的45元直径伸缩件组成的干涉仪，并在3-30微米的光谱带上观察。在这些波长，在父颗星的眩光中，在眩光中更容易检测到地球状片，但行星检测所需的角度分辨率意味着望远镜分离在75到200米之间，并且需要高达1000米的分离一般天体物理学。因此，干涉仪被设想为一系列自由望远镜。最近的TPF设计研究还考虑了将其作为单孔光学望远镜构成的可能性。然后可以通过跨直径8或10m的镜子来实现用于行星检测的所需角度分辨率。可能的设计包括具有圆形，方形，矩形或其他形状的入口瞳孔的调节子，在瞳孔中具有锥形传递，以抑制衍射图案中的不需要的侧叶。还提出了掩模掩模的血管刺痛，以更有效地抑制星光。对于这些调节件，主要挑战不仅包括抑制散射光，而是具有子NM控制的自适应光学系统的设计。将审查设计要求和目前的研究状态。 TPF是美国宇航局起源计划中的一个关键元素，目前正在预先进行预先研究阶段。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号